Spiral steel pipe (SSAW pipe) is a spiral seam steel pipe made of strip steel coil as raw material, extruded at regular temperature, and welded by automatic double-wire double-sided submerged arc welding process. The spiral steel pipe sends the strip steel into the welded pipe unit, and after rolling by multiple rollers, the strip steel is gradually rolled up to form a circular tube blank with an opening gap. Adjust the reduction amount of the squeeze roller to control the gap between the weld seams at 1~3mm, and make the two ends of the weld joints flush.
1. From the surface of the spiral steel pipe to see whether the production process of the spiral steel pipe is exquisite. The section of fake and inferior spiral steel pipe is oval. The reason is that the manufacturer saves raw materials, the reduction of the first two rolls of the finished product is slightly larger, the compressive strength of this spiral steel pipe is greatly reduced, and it does not meet the specifications and dimensions of the screw steel product.
The composition of the high-quality spiral steel pipe is symmetrical, the tonnage of the cold shear is high, and the inner hole of the cutting head is smooth and tidy. And counterfeit and shoddy materials, because these materials are poor, frequent use of cutting head holes will lead to uneven unevenness, and there is no metal texture.
2. Tap the spiral steel pipe and listen to the sound after tapping. If the sound is very crisp and the echo is not chaotic, it means that the spiral steel pipe is made of new material technology, rather than the comprehensive development and utilization of waste spiral steel pipe.
3. Spiral steel pipe butt weld shape detection is a detection mode with simple detection technology and universal application ability. It is an important content of finished product quality inspection. The key is to find out the defects and specification errors of the spiral steel pipe welding surface. Generally, it is tested by human eyes, relying on special tools such as specification models, instruments, and high magnifying glasses. If there are defects on the welding surface, there will also be defects inside the welding.
1. From the surface of the spiral steel pipe to see whether the production process of the spiral steel pipe is exquisite. The section of fake and inferior spiral steel pipe is oval. The reason is that the manufacturer saves raw materials, the reduction of the first two rolls of the finished product is slightly larger, the compressive strength of this spiral steel pipe is greatly reduced, and it does not meet the specifications and dimensions of the screw steel product.
The composition of the high-quality spiral steel pipe is symmetrical, the tonnage of the cold shear is high, and the inner hole of the cutting head is smooth and tidy. And counterfeit and shoddy materials, because these materials are poor, frequent use of cutting head holes will lead to uneven unevenness, and there is no metal texture.
2. Tap the spiral steel pipe and listen to the sound after tapping. If the sound is very crisp and the echo is not chaotic, it means that the spiral steel pipe is made of new material technology, rather than the comprehensive development and utilization of waste spiral steel pipe.
3. Spiral steel pipe butt weld shape detection is a detection mode with simple detection technology and universal application ability. It is an important content of finished product quality inspection. The key is to find out the defects and specification errors of the spiral steel pipe welding surface. Generally, it is tested by human eyes, relying on special tools such as specification models, instruments, and high magnifying glasses. If there are defects on the welding surface, there will also be defects inside the welding.
